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Troubleshooting
Service manual
174
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
1
Locate the branch selector box by checking indoor unit remote controllers
showing this error. Branch selector box that is connected to the indoor unit(s)
that show this error is subject to further investigation.
NOTICE
Other indoor units in the circuit will show U9 Error. This means "There is an error in
the circuit but it is not the unit that shows U9".
2
Check the transmission wiring between branch selector box and outdoor unit.
See
356].
Possible cause:
Faulty transmission wiring.
3
Perform a check of the branch selector box PCB. See
Possible cause:
Faulty branch selector box PCB.
4
Perform a check of the main PCB of the main outdoor unit. See
290].
Possible cause:
Faulty main PCB of the main outdoor unit.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.179 UA-26 – Branch selector box Abnormality - Transmission Wiring Abnormality on branch
selector box
Trigger
Effect
Reset
Transmission abnormality
detected between branch
selector boxes.
Alarm status ON.
Auto recovery when
transmission is normal
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1
Locate the branch selector box by checking indoor unit remote controllers
showing this error. Branch selector box that is connected to the indoor unit(s)
that show this error is subject to further investigation.
NOTICE
Other indoor units in the circuit will show U9 Error. This means "There is an error in
the circuit but it is not the unit that shows U9".
2
Check the transmission wiring between branch selector boxes. See
Possible cause:
Faulty transmission wiring.
3
Perform a check of the branch selector box PCB. See
Possible cause:
Faulty branch selector box PCB.
Summary of Contents for VRV IV+
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